Finding the Fourth Proportional to 13,281.98, 19,918.32 and 3,919.50

Step by Step Solution

1. Step 1: Write the proportion equation
   13,281.98 : 19,918.32 = 3,919.50 : x
2. Step 2: Convert to fraction form
   13,281.98/19,918.32 = 3,919.50/x
3. Step 3: Cross multiply
   13,281.98x = 19,918.32 × 3,919.50
4. Step 4: Simplify right side
   13,281.98x = 78,069,905.04
5. Step 5: Solve for x
   x = 78,069,905.04/13,281.98
6. Step 6: Final answer
   x = 5,877.88